remove errant line

Author: Teque5

tests/test_validation.py

@@ -19,8 +19,7 @@
 
 
 def test_valid_data():
-    """assure the supplied metadata is OK"""
-    invalid_metadata = dict(TEST_METADATA)
+    """ensure the default metadata is OK"""
     SigMFFile(TEST_METADATA).validate()
 
 
@@ -73,7 +72,7 @@ def test_version(self):
 
 
 class FailingCases(unittest.TestCase):
-    """Cases where the validator should throw an exception."""
+    """Cases where the validator should raise an exception."""
 
     def setUp(self):
         self.metadata = dict(TEST_METADATA)